In Victor Hugo's "Les Miserables," the quote illustrates the idea that during times of distress, different forms of emotional support emerge. Fever is depicted as something that upholds the sick individual, suggesting that physical ailments can often be demanding and consuming, requiring a unique kind of care. This implies a sense of compassion and the fragility of human health, emphasizing the importance of empathy and support for those who are suffering.

On the other hand, love is portrayed as the force that sustains the lover. It highlights the powerful and transformative nature of romantic affection, suggesting that love can provide strength and resilience. This contrast between the sickness of the body and the fervor of the heart illustrates the complexities of human experience, showcasing how we seek solace in both care and connection during our most vulnerable moments.